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2 # SPDX-License-Identifier: Apache-2.0
9     states are composed by groups of pre-defined pin muxing definitions and user
12     Each Zephyr-based application has its own set of pin muxing/pin configuration
13     requirements. The next steps use ESP-WROVER-KIT's I2C_0 to illustrate how one
17     Suppose an application running on top of the ESP-WROVER-KIT board, for some
20     you'll notice that the I2C_0 node is already assigned to a pre-defined state.
24         #include "esp_wrover_kit-pinctrl.dtsi"
28                 pinctrl-0 = <&i2c0_default>;
29                 pinctrl-names = "default";
33     From the above excerpt, the pincrl-0 property is assigned the 'i2c0_default'
35     (in this case, 'esp_wrover_kit-pinctrl.dtsi') on the same folder of the DTS file.
43                         bias-pull-up;
44                         drive-open-drain;
45                         output-high;
53     pull-up resistor soldered to GPIO_21's pin pad, in which case, 'bias-pull-up'
67     target SoC in the following URL
70     https://github.com/zephyrproject-rtos/zephyr/tree/main/include/zephyr/dt-bindings/pinctrl
73     The ESP-WROVER-KIT board is based on the ESP32 SoC, in that case, we search
74     through the file 'esp32-pinctrl.h' in the above URL. Luckily for us, there is
82     Now, we go back to edit 'esp_wrover_kit-pinctrl.dtsi' and create a new pin state
91                         bias-pull-up;
92                         drive-open-drain;
93                         output-high;
102           pin supports a set of properties required by the target peripheral.
106           bias-push-pull, drive-open-drain, etc) can be freely chosen, given the
115 compatible: "espressif,esp32-pinctrl"
119 child-binding:
122   child-binding:
127       - name: pincfg-node.yaml
128         property-allowlist:
129           - bias-disable
130           - bias-pull-down
131           - bias-pull-up
132           - drive-push-pull
133           - drive-open-drain
134           - input-enable
135           - output-enable
136           - output-high
137           - output-low
145           pin. The array elements are pre-declared macros taken from Espressif's